50.38% is the change from 266 to 400
Calculation steps:
[( 400 - 266 ) ÷ 266] x 100 = 50.38%
Formula
Percentage change = [(400 - 266) / 266] x 100
Subtract the new number by the original number
400 - 266 = 134
134 ÷ 266 = 0.5037593984962406
0.5037593984962406 x 100 = 50.38%